Belt-gearing



(No Model.)

T. H.- McGRAY.

BELT GEARING.

Patented Mar.31,1891.

UNITED STATES PATENT OFFICE.

THOMAS H. MCCRAY, OF CHIGAGO,ILLINOIS.

BELT-GEARING.

SPECIFICATION forming part of Letters Patent No. 449,166, dated March31, 1891.

Application filed May 20, 1890.

To all whom, it may concern.-

Be itknown that I, THOMAS H. MCURAY, residing in Chicago, county ofCook, and State of Illinois, and a citizen of the United States, haveinvented a new, useful, and Improved Belt-Gearing, of which thefollowing is a specification, reference being had to the accon1- panyingdrawings, in which- Figure 1 is a side view, part in elevation and partin vertical section, showing the Co,- belt passing around the wheel.Fig. 2 is a section on line 2 2 of Fig.1. Fig. 3 is a detail showing themanner of attaching or detachng one link of the belt from another. Fig.4 is an end view of a cog-link, and Fig. 5 is a plan view of a cog-linkand rectangular link.

The object of this invention is to provide an improved belt-gearin gcomposed of detaehable links and an improved wheel to drive or be drivenby the cogs on the belt, which I accomplish as illustrated in thedrawings, and as hereinafter described.

That which I claim as new will be out in the claims.

In the drawings I have shown a portion of a cog belt or chain, which iscomposed of alternate elliptical links A and rectangular linksB. Eachelliptical link A is provided with a slot or opening aon one side andwith a cog b on its opposite side. The rectangular linkB consists of twoside pieces 0 and two cross-bars (Z. The cross-bars cl are madecylindrical and may be cast or formed with the pieces 0. The opening ain the side of each elliptical link A is just wide enough to admit across-bar d of the rectangular link B. The links are coupled together byfirst inserting one cross-bar (Z through the opening a of one link andthen moving the cross-bar down to the end of the first link, as shown inFig. 3. The second elliptical link is then coupled to the rectangularlink by placing the second link in substantially the position shown inFig. 3 to permit the cross-bar to be readily passed through the openingand then passing the open link over the cross-bar. After the cross-barhas been passed through the opening the second link is drawn forward,bringing the cross-bar to the end of the link, as shown in section inFig. 1.

The cross-bar (Z of the rectangular links l3 pointed Serial No. 352,549.(No model are the proper distance apart to cause the ends of twoadjoining ellipticallinks A to meet between the bars, as shown insection in Fig. 1,'and the ends of the elliptical links A are rounded,so that in passing around a wheel the adjoining ends of the two linkswill bear against each other, thereby holding the belt steady andpreventing backlash.

C represents a wheel which is adapted to drive or to be driven by thecog-belt above described. The periphery of this wheel 0 is provided withseveral bearing-surfaces 6, each the length of a single belt-link A. Thenun1- ber of surfaces 6 may be varied, according to thesize of the wheeland length of the beltlinks. Each surface 6 of the wheel is providedwith a recess f, adapted to receive a cog b. The sides of each recess fare rounded, as shown in section in Fig. 1, to form engaging surfacesfor the cogs b, and are so formed as to bear against the cog atits base.The cogs b may be made the entire width of the beltlinks A, orthey maybe made a part only of the width. The recesses f of the wheel should beabout equal in width to the width of the cogs 19, leaving on each side arim g.

The wheel 0 is provided with a hole j at each recess f, through whichdirt may be discharged to prevent the recesses from being filled up. henthe wheel is large, it may be a spoke-wheel.

The bearing-surfaces e of the wheel 0 are coequal with the length of thelinks A for the purpose of giving the links a firm support when turningwith the wheel. This construction not only holds the cogs I) strongly inthe recesses, but also prevents any tendency to strain the links A inpassing round the wheel, and all tendency to spread or open the links atthe slot or opening A. The turning strain is entirely taken by the shortlinks B and the abutting of the links A at their curved adjoining endsprevents backlash at the under side of the chain when in use' and thekinking of the chain by displacement of the link ends. The location ofthe cog midway of the length of the elliptical links A has the effect ofshortening their action one-half either when driving or being driven, asthe pull or push is only from the cog to the end of the link when thewheel and the cogs are engaged. By this midway location of the cog thechain may drive or be driven in either direction by the single cog oneach link.

It will be observed that each of the links A is formed with arectilinear plane side opposite the side which is provided with the cogZ), and this rectilinear plane outer side contains the open slot a,which fulfills the conditions required for detachably engaging anddisengaging the coupling-links of the drive-belt, and owing to thisspecific construction when a series of links are coupled to form a boltthe top or outer surface of the latter forms a practically levelsurface.

\Vhat I claim as new, and desire to secure by Letters Patent, is-

1. A belt-gearing composed of elliptical links A and rectangular links13, said elliptical links A each having a cog I) on one side and anopening ('6 on the opposite side, ai1d said rectangular links 13 eachconsisting of side pieces 0 and cross-bars (7, said cross-bars beingconstructed to bring the adjoining ends of the links A in contact,substantially as specified.

2. A detachable link fora drive-belt, formed with curved ends toconstitute bearing-faces against; contiguous links, having a cog h onits inner side cmitrally between its curved ends and provided with therectilinear plane outer side located opposite the cog, and having theopen slot (6 for engaging and-disengagii'ig the link at will with thecouplinglinks of the drive-belt, substz'tntially as described.

3. A hclt consisting of alternate elliptical links A and rectangularlinks 1;, said links A being provided with a slot (L on one side and acog Z) on its opposite side midway of its length, in conibinatioi'i witha wheel having cog-recesses at regular intervals, substantially asspecified.

el. The detachable link for a drive-belt formed with curved extremitiesto constitute turning bearing-faces against contiguous links, having acog bon its inner side cei'itrally between its curved extremities, andprovided with a rectilinear plane outer side located opposite the cog,substantially as described.

THOMAS H. MOORA Y.

Witnesses:

HARRY 'l. J onus, A. ll. ADAMS.

